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Differences What are the advantages of each

Front view of Intel Xeon E5520

Reasons to consider the
Intel Xeon E5520

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Significantly higher clock speed 2.26 GHz vs 1.5 GHz More than 50% higher clock speed
Higher turbo clock speed 2.53 GHz vs 2.1 GHz More than 20% higher turbo clock speed
Much better overclocked clock speed (Air) 3.28 GHz vs 1.5 GHz Around 2.2x better overclocked clock speed (Air)
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much better overclocked clock speed (Water) 4.27 GHz vs 1.5 GHz More than 2.8x better overclocked clock speed (Water)
Front view of Intel D-1557

Reasons to consider the
Intel D-1557

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Much newer manufacturing process 14 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More cores 12 vs 4 Three times as many cores; run more applications at once
More threads 24 vs 8 Three times as many threads
Significantly lower typical power consumption 36.56W vs 65W Around 45% lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Newer Jan, 2016 vs Mar, 2009 Release date over 6 years later
Significantly lower annual home energy cost 10.84 $/year vs 19.27 $/year Around 45% lower annual home energy cost
Significantly lower annual commercial energy cost 39.42 $/year vs 70.08 $/year Around 45% lower annual commercial energy cost

Features Key features of the Xeon E5520  vs D-1557 

clock speed

Xeon E5520
2.26 GHz
D-1557
1.5 GHz

turbo clock speed

Xeon E5520
2.53 GHz
D-1557
2.1 GHz

overclocked clock speed (air)

Xeon E5520
3.28 GHz
D-1557
1.5 GHz

overclocked clock speed (water)

Xeon E5520
4.27 GHz
D-1557
1.5 GHz

TDP

D-1557
45W

Specifications Full list of technical specs

summary

Xeon E5520  vs
D-1557 
Clock speed 2.26 GHz 1.5 GHz
Turbo clock speed 2.53 GHz 2.1 GHz
Cores Quad core Duodeca core

features

Has a NX bit Yes Yes
Supports trusted computing No Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 45W
Annual home energy cost 19.27 $/year 10.84 $/year
Annual commercial energy cost 70.08 $/year 39.42 $/year
Typical power consumption 65W 36.56W

bus

Architecture QPI FSB
Number of links 2 1

details

Xeon E5520  vs
D-1557 
Architecture x86-64 x86-64
Threads 8 24
Manufacture process 45 nm 14 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 3.28 GHz 1.5 GHz
Overclocked clock speed (Water) 4.27 GHz 1.5 GHz
Overclocked clock speed (Air) 3.28 GHz 1.5 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1066
DDR3
DDR3-800
Channels Triple Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 25,599.99 MB/s 12,800 MB/s
Maximum memory size 147,456 MB 131,072 MB
Intel Xeon E5520
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Intel D-1557
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